Apparatus for dressing grinding wheels and holding work pieces thereto



Oct. 31, 1961 RQ n AND HOLDING A. AKERT 3,006,331 APPARATUS Fo REssINGGRINDING WHEELS woRx PIECES THERETO Filed arch 24. 1958 4 Sheets-Sheet 1Oct. 31, 1961 Y c. A. AKERT 3,006,331

APPARATUS FOR DRESSING GRINDING WHEELS AND HOLDING WORK PIECES THERETOFiled March 24, 1958 4 Sheets-Sheet 2 i@ @Maa/52W oct. 31, 1961 C. A.AKERT 3,006,331

APPARATUS FOR DRESSING GRINDING WHEELS v AND HOLDING WORK PIECES THERETOFiled March 24. 1958 4 Sheets-Sheet 3 3f/aide@ Oct. 31, 1961 3,006,331

C. A. AKERT APPARATUS FOR DRESSING GRINDING WHEELS AND HOLDING WORKPIECE-S THERETO Filed March 24. 1958 4 Sheets-Sheet 4 Wal Hmm

United States Patent Cce 3,006,331 Patented Oct. 31, 19761 3,006,331APPARATUS FOR DRESSING GRINDING WHEELS AND HOLDING WORK PIECES THERETOCarl A. Akert, 948 Cuyler Ave., Chicago, Ill. Filed Mar. 24, 1958, Ser.No. 723,538 18 Claims. (Cl. 12S-11) This invention relates to grindingwheels; to a tool adapted to dress or prole grinding wheels with botharcuate and flat surfaces; and to a novel grinding wheel auxiliary toolwhich readily may be employed to accurately dress a grinding wheelwithout the use of indicator gauges or other measuring devices, andwhich during `actual grinding operations further may be arranged foraccurately and assuredly positioning the work piece for which the wheelis dressed.

Devices of the general character of the type disclosed herein, ofcourse, have been known and extensively used for some time. Further, thetechnique of grinding surfaces of work pieces with profiled abrasivewheels is quite advanced and rapid. However, when using these knowndevices initially to dress a grinding wheel to the desired shape, thepreparation of the wheel is both time consuming and tedious, and moreoften than not consumes far more time than the actual grindingoperation. Besides, almost without exception, such known devices are ofcomplicated construction and operation -and further require the useeither of extraneous separate steel yguide tapes, special templates,gauge blocks, height and indicator gauges, or other measuring means toachieve the desired wheel profile. Diiiiculty of adjustment and lack ofprecision in practice are common; cut and try techniques or operationsprevalently are practiced to properly dress a Wheel. These practicesobviously are objectionable; since, they not only require considerabletime to achieve the desired results, but further require the employmentof highly skilled and expensive operators. Moreover, once a grindingWheel is dressed to the desired shape, none of these known devicesprovides means whereby the Work piece for which the wheel is shaped maybe readily held for the actual grinding operation. Such provision,besides being of great convenience, could appreciably increase theutility of the auxiliary device and cut down total expenditure of timeand preparation when grinding specially shaped surfaces.

The present invention, in contrast, contemplates the provision of anovel device with which grinding wheels may be dressed accurately andconveniently to various profiles; which provides its own means formeasuring various dressing operations; and which further is adaptable tohold the Work piece, for which a wheel is specially dressed, when thesame is being ground.

Accordingly, a primary object of this invention is to provide animproved auxiliary device for use with grinding Wheels, which deviceovercomes the foregoing and other shortcomings found in other prior artdevices used for similar purposes.

Another primary object of this invention is to provide a combinationtool arranged for dressing arcuate and other surfaces on grindingwheels, and for holding a Work piece for which a wheel is ground toshape.

Stated somewhat diiferently, it is an object of this invention toprovide a tool for use with grinding wheels, and including an arbor fordetachably receiving a Work engaging member which may be, for instance,either a grinding wheel cutting point or structure arranged to hold theWork piece for which a wheel is dressed to grind the same.

Another object is to provide means whereby the arbor and the workengaging member carried thereby may be readily and precisely positionedrelative to the grinding wheel, there being provision incorporatedwithin the herein tool for accurately measuring the positioning movementof the work engaging member.

As an aspect or corollary of the foregoing object it is within thecontemplation of the present invention to provide a tool having, -withinlimits defined only by its own size and the size of the Wheel to bedressed, infinite adjustment and measuring means for positioning theWork engaging member. p

Another objectof this invention is to provide a tool whereby theabrasive surface of a grinding wheel may be accurately profiled withoutrequiring highly skilled and expensive labor for such operation.

A further and more specic object is to provide a tool adapted to profileboth flat and arcuate shaped surfaces on a grinding wheel, and furtherto incorporate in said tool novel measuring means whereby the cuttingelement thereof may be readily and precisely positioned to produce thedesired shaped surface on said wheel.

A still further specific object of this invention is to provide agrinding wheel dressing tool which, when employed to profile arcuatesurfaces, has easily adjustable stop means providing limits for conningthe cutting tool within a prescribed path to achieve the desired wheelprofile.

Other speciiic objects of this invention are to provide the herein toolwith means whereby its arbor and work engaging member may be linearly orrotatably positioned, including means -for measuring the aforesaidmovements; to incorporate the arbor as a slidable head having actuatingand measuring means in the form of a calibrated micrometer adjustment toachieve linear movement; and to provide a rotary spindle to carry theslidable head, the spindle having a novel indexing plate with an annulararray of stops for measuring and limiting rotary movement.

Another specific object is to provide an auxiliary tool for use with,and dressing of, a grinding wheel, the tool having a work engaging arboror carrier including a novel plate having positionable stops forlimiting rotary movement of a carrier mounted cutting tool when dressingan arcuate surface in said wheel; the plate further including an annulararray of stops for measuring angular positioning movement of a carriermounted Work piece when grinding the surface of the latter With saidwheel.

Ancillary objects are to provide a grinding wheel auxiliary tool whichis strong of construction, yet has simplicity of design and a relativelyfew number of parts, and which thus is economical to manufacture; and toprovide a tool which otherwise is Well adapted to perform the servicesrequired of it.

The vforegoing and other objects, advantages and features ofconstruction will become more apparent upon a consideration of thefollowing description together with the accompanying drawings.

In the drawings:

FIGURE 1 is a side elevation view, partly in crosssection, showing theauxiliary device embodying the present invention prepared to dress awheel;

FIGURE 2 is a cross-sectional plan view taken on line Z--Z in FIGURE 1;

FIGURE 3 is a plan view of the auxiliary device;

FIGURE 4 is a front elevation view of the same;

FIGURE 5 is a diagrammatic view illustrating the manner in which thetool cutting element is variously positioned to prole a convex arcuatesurface of a grinding Wheel;

FIGURE 6 similarly illustrates posioning of the tool to achieve orprofile a concave grinding wheel surface;

FIGURE 7 is a View taken on line 7 7 in'FIGURE 1;

FIGURE 8 is an enlarged fragmentary view showing the positionable stops;

FIGURE 9 is a front elevation view of the work engaging member employedto hold the work piece for which a Wheel is dressed;

FIGURE 10 is a fragmentary cross-sectional view taken on line 10-19 inFIGURE 9;

FIGURE 11 is a front elevation view of the housing structure in whichthe slidable head is mounted;

FIGURE 12 is a view partly in cross-section illustrating means wherebypositioning of the rotatable plate may be interpolated between positionsdefined by its annular array of stops;

FIGURE 13 is a view taken on line 13-13 in FIG- URE 1; and

FIGURE 14 is a cross-sectional view taken on line 14-,14 in FIGURE 1.

The structure selected for illustration is not intended to serve as alimitation upon the scope or teachings of the invention, but is merelyillustrative thereof. There may be considerable variations andadaptations of all or part of the teachings depending upon the dictatesof cornmercial practice.

Referring to the drawings, the present invention for the purpose ofillustration is embodied in a tool 21 intended for use with a magneticchuck 22 of the grinding device. Support for the tool 211 is provided bya pedestal or base 23 having a ilat undersurface 24 and made of suitablemagnetic material. An upstanding standard or vertical support bracketstructure 25 is provided medially of the base 2,3 and integrallytherewith. The support bracket structure 25 is provided with an opening26 extending horizontally therethrough, and in which there is mounted abearing collar 27 in bearing contact with a rotatable shaft 28. Thebearing collar 27 protrudes outwardly .from the support bracketstructure 25 for engagement with an annular shoulder 2.9 integrallyprovided in shaft 28, thereby preventing axial movement of shaft 28 tothe left, as seen in FIGURE l. At its outer or rearward .end 30, shaft28 has mounted thereto an axially extending handle 31 which is suitablyknurled to facilitate handling vand turning of the shaft 28. A set screw3-2 provides means for facile attachment and removal of the handle V31to and from the shaft 28.

At its end 33- extending forwardly from the support structure 25, theshaft 2S carries an assembly 34 which includes a housing 35, an annularmember 36 encircling housing 35 and press fitted to and secured thereon,and stops 37, 38, positionably adjustable on member 36. To facilitatemounting of the stops 37, 38, member 36 is provided with an annulararray of uniformly angularly spaced threaded openings 39, and each stopis provided with a body portion 4() having an arcuate slotted opening 41therein for coincidental arrangement with the array ,of threadedopenings 39. The effective or protruding portion 42 of each stop extendsgenerally radially with respect to the array of openings 39. To secureeach stop 37 or 38 at a desired position, head screws 43 may -b eprovided for extension through the respective slot 41 and threadableengagement into matching openings 39.

The housing, 35, as seen in elevation in FIGURES 1, 2 and 11, isprovided in its front surface with a longitudinal passage 44communicating between what normally are its upper and lower surfaces 45,46, respectively. At its forward side 47, the passage 44 is enlarged andcovered by spaced plates 48, 49, secured to the housing 35 by suitablefasteners, such'as screws 50, to in effect provide an undercut passagein the housing 35. A head 51 is slidably lmounted in the passage 44, thehead 51 being provided with guides 52 at opposed sides thereof formatching engagement with the undercut construction within the housing35.

To slidably position head 51 a Vscrew adjustment is provided andincludes a shaft 53 Iwhich is rotatably jour- Vnalled in the housing 35and mounted therein against Vaxial movement.

through an opening in a boss 55 provided reanwardly of the head 51 andintegral therewith. Turning of shaft 53, thus, correspondinglycausesrhead 51 to move slidably in either of opposed directions inpassage 44.

At its outer end the shaft 53 is provided With an appropriatelycalibrated and knurled handle 56, an indicator 57 further being providedon housing 35 to facilitate reading of the calibrations 58. On the faceof plate 46 a further Vernier scale 59 may be provided lwhile the head51 may be provided -with a form of pointer or indicator 60 by which headmovement further may be measured, the combined readings of the scales58, 59, being such as to give measurements in a manner similar to theusual micrometer. A set screw 61, extending through housing 35 andengageable with the slidable head 51, is provided to lock the head 5-1at any desired setting.

The assembly 34 is mounted securely to the forward end 33 of the shaft28 by means of another set screw 62 which is arranged to bear againstthe shaft end 33, as -best seen in FIGURE 2. The enti-re assembly 34thus may be readily mounted to and removed from the shaft 28.

The slidable head 51 further carries a :forwardly extending carryingnlock or mounting boss 63 having a horizontal central `bore 64 and rigidvertical lip 65 at one side thereof. A set screw 66 projects radiallyinto the bore 64, in preparation for receiving and retaining the shankof a work engaging member therein.

Referring to FIGURES l, 3 and 4, the Work engaging member is exemplifiedtherein as a cutting tool 67, including a shank 68 matingly engagea'b-leWithin the bore 64,an outwardly extending arm portion 69 integraltherewith, and provided with a bore 7i) wherein there is seated theshank 71 of a mounting member 72 carrying a cutting element 73 whichpreferably is a diamond. A set screw 74 is threadable into the arm 69for engagement with the shank 71 t-o retain Ithe latter in bore 79. Asseen in FIGURE 3, the lip 65 is engageable against the at side surface75 of arm 69 to prevent the latter and its shank 68 from turning in bore64.

It will -be apparent that as shaft 28 is rotated by Vmanipulation ofhandle 31 the entire assembly 34 rotates.

Correspondingly, the stops 37, 38, and in particular their protrudingportions 42, follow a predetermined circular path.

Referring back to FIGURES 3 and 4, a spring biased `stop pin 76 ismounted in a sleeve 77 for axial movement therein. The sleeve 77 isfixed to the side of the support structure 25, while the pin 75 furtheris so arranged and positioned as to be capable of being selectivelyprojected or interposed into the circular path of the protrudingportions A42 of stops 37, 33 to limit the movement thereof, and,consequently, to limit theV rotation of the ent-ire assembly 34. Tofacilitate axial positioning of pin 76, at one end thereof there isprovided a knurled handle 78.

Refer-ring to FIGURES l, 5 and 6, the cutting element 73Vis illustratedin readiness to dress or prole a grinding wheel '79 which generally ismounted for rotation about what may be considered a fixed axis (notshown). Further, when dressing a wheel 79 the center line of the tool oraxis of rotation l of the shaft 28 is aligned generally parallel withthe medial plane of the vwheel 79, or perpendicular to the grindingwheel axis of rotation. As a result as shaft 28 rotates it sweeps thecutting element 73 in an arcuate path generally perpendicular to theplane of the wheel 79. This, of course, is true when the cutting elementis offset from the axis of rotation 80. When the cutting element 73 ispositioned directly in alignment with the axis of rotation S0, rotationof shaft 28 merely turns the element about a pivot point coincident withthe axis Si). For `the purpose of calibration land measurement, thatpoint at which the element 73 is directly upon the axis of shaft 2Srotation is designated the zero or centered position of the Itool andthe calibrated scales 58, 59, accordingly are set at a zero or startingreading.

To achieve this zero setting of cutting element 73, the arm portion 69is provided with an offset 81 of sufficient dimension to compensate forthe mounting height of the element 73 above the arm 69.

`FIGURE 5 illustrates the cutting element 73 at alternate positions,shown in phantom lines, when dressing a convex surface 82 on thegrinding wheel 79. To achieve the desired radius of curvature on thewheel surface, the cutting element is first positioned below the axis ofrotation 80 of shaft 2S at a distance corresponding to the desiredradius of the surface 82. This is achieved by turning micrometer screwhandle 56 and measuring olf the distance on calibrated scales 58, 59. Tomeasure oi the desired amount or length of arc through which the elementis to travel the limit stops 37, 38, are appropriately mounted to thecorrect openings 39 and pin 76 is projected int-o the path of rotationof ythe stop portions 42 -to thereby provide limits dening the ends ofthe arcuate path which the portions 42, and consequently the cuttingelement 73, travel.

Similarly, the concave surface 83 cut in the grinding wheel is Vachievedby measuring o the desired radius of curvature on the scales 58, 59. Inthis case, however, the cutting element is disposed or positioned abovethe axis 80. The sweep of the cutting element 73, or the length of itsarc of travel, again is defined by appropriately setting the stops 37,38.

Referring to FIGURES 9 and 10, the tool is illustrated with another formof work engaging member mounted thereto. As shown this member includes ashank 63a matingly engageable in the 4bore 64 and capable of beingsecured therein by set -screw 66. A generally flat plate structure S4 iscarried by the shank 63a and further has an undercut slot 85 provided inits forward flat surface 86. The plate 84 may be of any general shape,although it is illustrated as circular, and lfurther it is provided withthreaded openings 84a extending therethrough and arranged in the hereinexempliiication in a series of concentric annular arrays of openings.The work engaging member, or plate 84, is employed to hold work pieces(not shown) to be ground by the grinding wheel. The work piecesgenerally are strapped or bolted to the plate 84. Often, once a 'wheel79 is dressed, using the work engaging member cutting tool 67, the tool67 may be removed, the plate 84, with the work piece to be groundmounted thereon, set in place, and the actual grinding operation allowedto proceed. Other times the work Vpiece may require truing on the plate84. But in either case, accurate movement of the slidable head 51correctly positions the work piece relative to the wheel 79, andprecision positioning is readily achieved by measuring the movement onthe scales 58, 59.

As further seen in FIGURES 9 and l0, the plate 84 Vmay carry a V-block87 mounted thereto. To mount the V-block 87, a passage 88 communicatesbetween opposed surfaces of the same, and a screw 89 extends in thepassage 88 to a position Whereat it is threadably engageable in a squareheaded nut 90 sildably mounted in the undercut slot 85. Once the V-blockis positioned as desired, tightening `of the screw 89 with the nut 90locks it in place. The slot 85 is so arranged that with the housing 51set at the zero position and the axis of shank 68a is coincident withthe axis of shaft 28, the slot 85 extends radially of the axis of shank68a and shaft 28. The slot 85 is further arranged to extenddiametrically across the plate 84.

The V-block 87 further is provided with parallel Slots 91, 92,respectively provided in its opposed sides 93, 94. A clamp 95 is mountedto the V-block `87, the clamp comprising an inverted U-shaped member 96having inwardly facing legs 97, 97, arranged for slidable mounting inthe slots 91, 92. A screw 98 is threadable through the base portion 99of the U-shaped member 96 for engagement against a work piece 109 heldon the upwardly dverging surfaces 101, 102 of the V-block 87. As thescrew 98 is threaded down into engagement with the work piece 100, theU-shaped member 96 is drawn upwardly and the work piece 100 is heldfirmly in place. Referring back to FIGURES 1 and 7, the member 36 isprovided with means for angularly positioning the assembly 34, and inparticular the plate 84 when the same is carried thereby. This means isexemplified herein by arranged as a second annular array of openings 103in member 36 concentric with the openings 39 therein. A stop 104 isarranged on support structure 2S for selective engagement in any opening103, the stop 104 being mounted in -a sleeve 105 for axial movementltherein. A compression spring 106 is provided about stop 104 and isanchored between a collar 107 on stop 104 and a shoulder 108 within thesleeve 105. Medially of its ends stop 104 is provided with a diametrallyextending pin 109 providing opposed projections intended -for selectiveregistry with diametrally opposed slots 110 in sleeve 105 when the stop104 is located in its foremost position whereat it is seated in lanopening 103. At its outermost end the stop 104 is provided with aknurled knob 111 by which it may be axially and radially moved. It willbe understood that to render the stop 104 ineffective, it is withdrawn,against the action of spring 106, tol a position whereat upon radiallyturning the knob 111 the pin 109 is positioned to engage against theouter end of the sleeve 105. For the purpose of brevity, only theactuating structure of pin 104 has been described in detail; although,the structure for pin 76 is similarly arranged As the handle 31 isturned, it rotates the assembly 34, the plate 84 carried thereby, andthe work piece mounted to the plate 84. To position the work piece withreference to the grinding Wheel 79 so as to grind surfaces thereon atany desired angle, the assembly 34 is Ilocked at the desired angularposition by engaging the stop 104 in the opening 103 positioned beforeit. As illustrated in FIGURE 7, there are twelve openings 103 uniformlyangularly spaced apart by thirty degrees. Further, appropriate marks maybe provided on member 36 to yfacilitate grinding. That is, if ahexagonal shaped work piece is to be ground, the operation may beperformed by .successively positioning those openings 103 having a 6designation thereat before the stop 104. Similarly, the surfaces ofthree and four sided work pieces may be ground in the same manner. Whenit is desired to lock the assembly 34 yand Work piece at -an angularposition other than those :for which the openings 103 are provided, thelock structure 112 shown in FIGURE 12 is employed. This structure 112includes a screw 113 threadable in an opening 114 in standard 25 andengageable against shaft 28 to lock lthe same in interpolated positionsintermediate those Afor which 'the openings 103 are provided.

Thus, with yan url-profiled wheel 79, that is one having only a flatgrinding surface thereon, angular surfaces may be ground on a work pieceby engaging the same with the wheel 79. And, this is `accomplishedWithout necessarily profiling angular grinding surfaces into thegrinding wheel.

It further should be observed that ythe member 36, its array of openings103, and the stop 104 selectively engageable therein, ideally providemeans whereby the slidable head 51 may follow -a linear path disposed atany angle. Thus, with the cutting tool 67 mounted to head 51, and themember 36 rotated to -a desired angular position, by properlymanipulating the screw adjustment handle 56, the cutting element 73 maybe moved relative to and across the face of the grinding wheel 79 toproiile or dress a predetermined angular surface thereon.

In much the same manner, as explained hereinbefore, with a mountingplate 84 tixed to the head 51, yangularly positioning member 36correspondingly angularly positions the work piece secured to plate 84.Thereafter, relative movement between the wheel 79 and work piece, tobring the latter into contact with the wheel 79, grinds the desiredsurface on the work piece.

To prevent backlash and inaccurate movement of the micrometer screw 54,the split friction construction shown -in FIGURES 1, 13 and 14 may beprovided. As illustrated, the boss 55 is of .-a slotted construction andhas -machine screws 115, 115, provided therein to draw the `lbossportions 117, 117, together to vary the frictional engagement with screw54 as wear occurs. If the adjustment is too tight, it maybe changedslightly by turning screw 116, which bears against one of the portions117,

'to ease the `frictional engagement with screw 54.

Briefly, operation and use of the herein tool is as follows. To providean arcuate surface in a grinding wheel lthe tool is set as seen inFIGURE l.

Thereafter, the radius of curvature of Ythe desired surface is measuredoff by turning screw S4 and measuring off the correct distance on thecalibrations 58, 59. To limit the arc or sweep of the cutting element73, the stop structures 37, 38, are set on member 36 and the cooperablepin 76 is moved to an e'lfective position whereat it is engageable withthe stops. To provide a convex surface Vin the grinding Wheel, thecutting element 73 is moved below the axis of rotation 80; while toprovide a concave surface on the wheel 79, the cutting element 73 ismoved to a measured position above the axis 80. When proiiling sucharcuate Surfaces lon a wheel, the sweep of the cutting element 73 is ina plane generally perpendicular to the plane of the Wheel 79.

To grind an angular surface on the wheel 79, the entire assembly isrotated -to the predetermined angle and is locked in position byengaging stop 104 in the proper opening 103 positioned before it. If theangular surface is `other than those -which the openings 103predetermine, the assembly 34 may lbe rotated to the desired angle andlocked in position by screw 113. Thereafter, by turning screw lhandle56, `the head 51 carries the cutting element 73 angularly across thewheel 79 to provide the desired angular surface thereon. I-t will beapparent, of course, that by employing the herein structure it ispossible to provide a combination of angle and radius curvatures on the:wheel 79.

When grinding a work piece, the cutting tool 67 is replaced by theappropriate work piece retention structure shown in FIGURES 9 and 10.Gener-ally, to grind small articles of round configuration the V-blockstructure 87 is employed. Larger work pieces, and those of varied shape,generally are strapped to plate 84 and trued Ithereon. Thereafter, thework piece is introduced to the surface of the grinding wheel 79.Specifically, angle grinding is achieved by setting member 36 at thedesired langles and introducing the -work piece to the at proiled wheel79. As another example, after a wheel is dressed, for instance with aconcave profile, the plate 84 is tted to the head 51 and arranged tointroduce the work piece, for which the wheel 79 had been proiiled, tothe wheel 79. For this operation the work piece is moved in a directiongenerally parallel with the plane of the wheel 79 or perpendicular tothe axis of rotation thereof.

Generally, when dressing arcuate surfaces into a wheel 79, and whenemploying the V-block structure S7 to grind a work piece of Vroundconfiguration, the assembly 34 is locked in a vertical position, `asseen in FIGURES 1, 4 and 9. From such position, positioning movements ofthe ywork engaging lmember may be readily measured. However, it shouldbe understood that positioning movement of the work engaging membersalong paths other than those achieved with the set up in FIGURES 1, 4and 9 may be readily measured without any appreciable calculation.

The herein invention thus provides a convenient and easy to use toolboth for dressing grinding wheels and holding work pieces to be groundand for which the wheels are dressed. It should be understood that whenredressing a wheel 79, the amount of wheel diameter reduction can becompensated for by a corresponding Vmovement of the wheel Vtowards thecutting element.

Alternatively, the amount of reduction in diameter may be `compensatedyfor by correspondingly increasing the micrometer positioning movementof the element 73, as read on the calibration 58, 59.

The herein construction further provides a tool which may be readilybroken down and reassembled as the need arises. The rotatable shaft 2S,its handle 31, housing 35 and annular member 35 are arranged for quickattachment and detachment. For that matter, however, they may be ofintegral construction depending upon production and use considerationsand the dictates of commercial practice. The assembly 34 includes thehousing 35, `head 51 slidably mounted therein, and annular member 36which as a unit combine to provide a novel Work engaging arbor orrotatable carrier further provided with its own integral measuring meansfor accurately positioning the work engaging member carried thereby. Themember 36 further provides structural indices both for limiting thesweep of the cutting element 73 when dressing arcuate surfaces and meansfor angularly positioning the arbor either for dressing angular surfaceson a Wheel 79 or grinding a Work piece.

With the arrangement of the parts above described, it will be apparentthat a highly simple, relatively inexpensive and very accurate grindingwheel auxiliary tool is provided. The replaceable and interchangableWork engaging members provide a substantially increased utility for asingle tool of this character. These features, coupled with the factthat accurate positioning movement of the work engaging member ismeasured without the employment of extraneous indicator gauges and thelike provide a tool of enhanced use and value heretofore unknown.

It will be understood, as indicated above, that changes in 'constructionand arrangement of parts may be resorted to Without departing from thefield and the spirit of the invention; that in this application only one4form of the invention has been disclosed; and that the scope of theinvention is deiined in the appended claims.

What is claimed is:

l1. A grinding wheel auxiliary tool comprising: a base, a verticalsupport bracket rigidly xed to said base, a carrier assembly revolublymounted about an axial shaft carried by said base bracket, a housing anda head mounted for adjustable movement diametrically of the axis ofrotation of the carrier assembly, a work engaging member detachablycarried by the head, a micrometer screw drivably associated with thehead to move the work engaging member relative to said shaft formeasured distances in either of opposed directions from said shaft axis,and means in association with the micrometer screw calibrated to thework engaging member to indicate and directly measure linear positioningmovement of the head and the work engaging member carried thereby forpredetermining the arc or" movement of said work engaging memberrelative to a grinding wheel rotatively mounted in fixed relationthereto.

2. The grinding wheel auxiliary tool described in claim 1 andadditionally including an indexing member in rigid association with thecarrier assembly and provided with an annular arrayV of angularly spacedstructural indices, and means arranged for selective cooperable actionwith any of ,the structural indices thereby to effect limitation of theangular swing of the carrier assembly and the Work engaging membercarried thereby.

3. The grinding Wheel auxiliary tool described in claim 2 wherein theWork engaging member comprises an arm mountable to the head and agrinding Wheel cutting element detachably carried by the arm in axialalignment with said carrier assembly shaft.

4. The grinding Wheel auxiliary tool described in claim 3 wherein theindexing member and its structural indices -comprise a plate memberprovided with an annular array of uniformly angularly spaced openingsconcentric With the axis of rotation of the assembly and a pair of stopandassi members selectively positionable in any of the openings topredetermine the arc of rotation of the assembly, the means cooperablewith the structural indices being selectively interposable into the pathof the stop members and engageable thereby to limit the swing rotationof said carrier assembly.

. 5. The grinding wheel auxiliary tool described in claim 3 wherein thework engaging member comprises a support plate provided with meanswhereby a work piece is mountable thereto.

6. The grinding wheel auxiliary tool described in claim 5 wherein theindexing member and its structural indices comprise a plate memberprovided with an annular array of openings therein concentric with theaxis of rotation of the assembly, and the means cooperable with thestructural indices comprises a pin selectively seatable in the openingsto lock the assembly and the plate carried thereby at selectedpredetermined angular positions.

7. The grinding wheel auxiliary tool described in claim 6 andadditionally including means associated with the base and arranged tolock the assembly in angular positions other than those dened by theannular array of openings.

8. The grinding wheel auxiliary tool described in claim 6 andadditionally including indexing marks on the plate member to designatethose openings of the array of openings positionable before the pin sothat specifically shaped work pieces may be ground.

9. The grinding wheel auxiliary tool described in claim 5 wherein themeans provided with the support plate includes a work piece mountingblock adjustably positionable on the support plate and having downwardlyconverging surfaces for seating a work piece thereon, and clamp meanscooperably arranged with the block for maintaining the work piecethereon.

10. A grinding wheel auxiliary tool comprising: a frame including a ilatbase adapted for seating at the work area of a grinding machine and anupstanding support extending from said base; a horizontal shaftrotatably mounted in the upstanding support; a handle provided adjacentone end of the shaft to effect manual rotation thereof; a housing xablycarried at the other end of said shaft for rotation therewith; a memberrigidly associated with said shaft and having an annular array ofuniformly angularly spaced structural indices arranged concentric withthe axis of rotation of said shaft; means arranged for cooperable actionwith said indices and limitation of the angular positioning of saidshaft; a carrier head mounted in said housing and movable thereindiametrically across said axis of rotation; a micrometer screw rotatablymounted in said housing, restrained therein against axial movement, andthreadably engageable with said carrier head to move the latter relativeto said shaft on said upstanding support for measured distances ineither of opposed directions from said shaft axis; calibrationsassociated with said screw and arranged for registry with indicatingmeans on said housing to directly measure linear positioning movement ofsaid carrier head relative to said shaft; and a work engaging memberincluding a shaping tool in axail alignment with said shaft detachablycarried by said carrier head whereby said micrometer screw andcalibrations directly predetermine the path of movement of said workengaging member relative to a grinding wheel rotatively mounted in fixedrelation thereto.

1l. A grinding wheel auxiliary tool comprising: a support bracket frame,a rotatable shaft fixedly supported on said bracket frame, a handleprovided for said shaft to effect manual oscillation thereof, a workengaging member, structure arranged with said shaft for rotationtherewith and provided with positioning means whereby said work engagingmember is movable and indexed for direct measurement relative to anddiametrically across the axis of rotation of said shaft, said workengaging member including dressing instrumentalities in axial kalignmentwith said shaft,

means for Calibrating angular rotation and linear movement of said workengaging member including an indexing member provided rigid with saidshaft and having an annular array of uniformly spaced structural indicesarranged concentric with said axis, means cooperable with said indicesto limit angular positioning of the shaft, and calibrations associatedwith said positioning means for directly measuring linear positioningmovement of said work engaging member on said support bracket framerelative to said shaft to predetermine the path of movement thereofrelative to a grinding wheel rotatively mounted in fixed relationthereto.

12. A grinding wheel auxiliary tool comprising: a support frame seatableat the work area of a grinding machine, a shaft rotatably mounted onsaid frame, means on said shaft to effect manual rotation thereof, aWork engaging member, a housing carried on said shaft for rotationtherewith, a carrier lhead mounted to the housing for movement thereindiametrically across the axis of rotation of said shaft and providedwith means for detachably receiving the work engaging member, amicrometer screw drivably associated with said 4carrier head to move thesame in either of opposed directions, calibrations associated with saidscrew for directly measuring linear positioning movement of said carrierhead and said work engaging member relative to said shaft on saidsupporting frame to predetermine the radius of the arc of movement forsaid work engaging member, an indexing plate in rigid association withsaid shaft and provided with an annular array of openings thereinconcentric with said axis of rotation, stops adiustably positionable insaid openings to predetermine the arc of rotation of said shaft, andmeans mounted with said frame and selectively interposable into the pathof said stops for engagement therewith as said shaft is rotated to limitthe degree of shaft rotation and predetermine the arc of displacement ofsaid work engaging member, whereby said micrometer screw and indexingplate directly predetermine the path of movement of said work engagingmember relative to a grinding wheel rotatively mounted in fixed relationthereto.

13. The grinding wheel auxiliary tool described in claim 12 wherein thework engaging member comprises an arm mountable to said carrier head andan element for profiling and dressing a wheel.

14. 'I'he grinding wheel auxiliary tool described in claim 13 whereinthe indexing plate further is provided with a second annular array ofopenings which are uniformly angularly spaced and also arrangedconcentric with said shaft, and means mounted to said frame andselectively seatable in the openings of the second array thereof to locksaid shaft, said indexing plate, and said work engaging member inpredetermined angular positions.

15. The grinding wheel auxiliary tool described in claim 12 wherein thework engaging member comprises a work piece support structure providedwith means whereby a work piece is mountable thereto, and additionallyincluding a second annular array of openings in said indexing plateuniformly angularly spaced from openings adjacent thereto and alsoarranged concentric with said axis of rotation, and means mounted tosaid frame and selectively seatable in the openings of the second arraythereof to lock said shaft, said support structure, and the Work piecemounted thereto in predetermined angular positions.

16. A grinding auxiliary tool comprising: a support frame, a shaftrotatably mounted on said frame, means on said shaft to effect manualrotation thereof, a work engaging member, a housing carried on saidshaft for rotation therewith, a carrier head mounted to the housing formovement therein and provided with means for detachably receiving thework engaging member, a micrometer screw drivably associated with saidcarrier head to index and move the same in either of opposed directionsrelative to said shaft axis for direct measured distances therefrom,calibrations associated with said screw 1 1 for directly measuringlinear movement of said carrier head and said work engaging memberrelative to said shaft on said support frame to predetermine the radiusof the arc of movement for said work engaging member, an indexing platein rigid association with said shaftk and provided with an annular arrayof openings therein concentric with the axis of rotation of said shaft,and means mounted to said frame and selectively seatable in any of saidopenings to lock said shaft and said work engaging member inpredetermined angular limiting positions,

`whereby said micrometer screw and indexing plate directly predeterminethe path of movement of said work engaging member relative to a grindingwheel rotatively mounted in fixed relation thereto.

17. The grinding wheel auxiliary tool described in claim 16 wherein thework engaging member comprises a grinding wheel dressing elementprovided With means for mounting the same to the head.

18. The grinding wheel auxiliary tool described in claim 16 wherein thework engaging member comprises a support plate provided with means formounting a Work piece thereto.

References Cited in the le of this patent UNITED STATES PATENTS 893,954Huel Iuly 21, 1908 Y1,997,862 Halborg et al. Apr. 16, 1935 2,343,637Bochenek Mar. 7, 1944 2,404,148 Thompson July 16, 1946 2,442,453 BleyJune 1, 1948 2,642,856 Calloway June 23, 1953 2,744,515 Bruderick May 8,1956 FOREIGN PATENTS 334,558 Great Britain Sept. 5, 1930 517,883 ItalyMar. 3, 1955 720,317 Great Britain Dec. '15, 1954 OTHER REFERENCES WheelDressing, etc., by Yarema; Machinery, pages 20 469 to 471, March 13,1952, vol. `80. (Copy in Division

